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Questions and Answers
If a private residence has a single fire extinguisher, where should it be located?
If a private residence has a single fire extinguisher, where should it be located?
Kitchen
Which class of fire includes cloth?
Which class of fire includes cloth?
- Class B
- Class D
- Class A (correct)
- Class C
What is the most commonly used extinguishing agent for class A fires?
What is the most commonly used extinguishing agent for class A fires?
Water
Which class of fires involves energized electrical equipment?
Which class of fires involves energized electrical equipment?
Which extinguishing agent is suitable for use on a class C fire?
Which extinguishing agent is suitable for use on a class C fire?
The traditional symbol for a class D fire extinguisher is a(n) ___________.
The traditional symbol for a class D fire extinguisher is a(n) ___________.
A class C extinguisher is rated for use on ________.
A class C extinguisher is rated for use on ________.
What does it mean when a fire extinguisher has a pictograph with a red slash through it?
What does it mean when a fire extinguisher has a pictograph with a red slash through it?
To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must ________.
To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must ________.
Dry chemical extinguishers may be used on class C fires because they __________.
Dry chemical extinguishers may be used on class C fires because they __________.
Which statement about the numerical rating of a class K extinguisher is correct?
Which statement about the numerical rating of a class K extinguisher is correct?
What residue does a CO2 fire extinguisher leave when discharged?
What residue does a CO2 fire extinguisher leave when discharged?
The use of halon 1211 is strictly controlled because it is ______.
The use of halon 1211 is strictly controlled because it is ______.
Which agent is approved for use in a class K system?
Which agent is approved for use in a class K system?
Class D agents work primarily by _____.
Class D agents work primarily by _____.
A class A fire extinguisher with a numerical rating of 2 contains ______________ gallons of water.
A class A fire extinguisher with a numerical rating of 2 contains ______________ gallons of water.
What is the best way to extinguish a class C fire?
What is the best way to extinguish a class C fire?
Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?
Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?
Which hazard category includes automotive service or repair facilities?
Which hazard category includes automotive service or repair facilities?
Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?
Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?
How do multipurpose dry chemical agents prevent rekindling of class A fuel?
How do multipurpose dry chemical agents prevent rekindling of class A fuel?
A class B foam extinguisher is not rated for which fuel?
A class B foam extinguisher is not rated for which fuel?
Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?
Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?
Which statement is correct regarding class D extinguishing agents?
Which statement is correct regarding class D extinguishing agents?
What does a rating of 40 on a class B extinguisher mean?
What does a rating of 40 on a class B extinguisher mean?
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Study Notes
Fire Extinguisher Locations and Classes
- A single fire extinguisher in a private residence should be located in the kitchen.
- Class A fires involve combustible materials such as cloth.
- The most common extinguishing agent for Class A fires is water.
- Class C fires involve energized electrical equipment.
Extinguishing Agents and Symbols
- Carbon Dioxide is suitable for use on Class C fires.
- A Class D fire extinguisher traditionally displays a yellow star symbol.
- Class C extinguishers are specifically rated for use on energized electrical equipment.
- A pictograph with a red slash on a fire extinguisher indicates that using it on that class of fire could be hazardous.
Fire Extinguisher Ratings and Hazards
- For a space to qualify as a light hazard, the majority of materials must be noncombustible.
- Dry chemical extinguishers are safe for Class C fires as they do not conduct electricity.
- Class K extinguishers do not have a numerical rating.
- CO2 fire extinguishers leave no residue when discharged.
Environmental Considerations and Specific Agents
- The use of Halon 1211 is controlled due to its harmful impact on the environment.
- Wet chemical agents are approved for use in Class K systems.
- Class D agents extinguish fires primarily by forming a crust over the fuel.
Numerical Ratings and Operational Procedures
- A Class A fire extinguisher rated 2 contains 2.5 gallons of water.
- The best method to extinguish a Class C fire is to shut off the power and treat it as a Class A or B fire.
- The pictograph system depicts Class A fires with a burning trash can next to a wood fire.
Hazard Categories and Extinguishing Methods
- The "Extra" hazard category includes automotive service or repair facilities.
- Placing a foam blanket over a burning liquid cuts off the oxygen supply.
- Multipurpose dry chemical agents prevent rekindling of Class A fuel by forming a crust over it.
Limitations and Maintenance
- A Class B foam extinguisher is not rated for cooking oil.
- Dry chemical extinguishers should be serviced and recharged after any discharge.
- Each Class D extinguishing agent must specifically match the fuel type it is intended to combat.
Extinguisher Ratings
- A Class B extinguisher with a rating of 40 indicates sufficient extinguishing power for 40 square feet of burning fuel.
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